diff --git a/logger/logger_test.go b/logger/logger_test.go
new file mode 100644
index 0000000..08ef07e
--- /dev/null
+++ b/logger/logger_test.go
@@ -0,0 +1,47 @@
+package logger
+
+import (
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap/zapcore"
+	"os"
+	"path"
+	"testing"
+)
+
+func Test_init(t *testing.T) {
+	pwd := path.Dir(zapCaller().File)
+	assert.Equal(t, path.Join(pwd, "../"), project)
+
+	assert.NotNil(t, logger)
+	assert.NotNil(t, logger.entry)
+	assert.NotNil(t, logger.level)
+
+	assert.Equal(t, logger.verbose, false)
+	assert.Equal(t, logger.prefix, "[XProxy]")
+	assert.Equal(t, logger.level.Level(), InfoLevel)
+
+	assert.Equal(t, len(logger.plain.writers), 0)
+	assert.Equal(t, len(logger.colored.writers), 1)
+
+	for _, level := range []zapcore.Level{DebugLevel, InfoLevel, WarnLevel, ErrorLevel, PanicLevel} {
+		logger.level.SetLevel(level)
+		assert.Equal(t, logger.entry.Level(), level)
+	}
+	logger.level.SetLevel(InfoLevel) // revert to INFO level
+}
+
+func Test_addWrites(t *testing.T) {
+	core := new(logCore)
+	assert.Equal(t, len(core.plain.writers), 0)
+	assert.Equal(t, len(core.colored.writers), 0)
+
+	core.entry = nil
+	core.addPlainWrites(os.Stdout, os.Stdout, os.Stdout)
+	assert.NotNil(t, core.entry)
+	assert.Equal(t, len(core.plain.writers), 3)
+
+	core.entry = nil
+	core.addColoredWrites(os.Stderr, os.Stderr, os.Stderr)
+	assert.NotNil(t, core.entry)
+	assert.Equal(t, len(core.plain.writers), 3)
+}